A point source of light 'S' at a distance d from the screen A produces light intensity `I_(0)` at the centre of the screen. If a completely reflecting mirror M is placed at a distance d behind the source as shown in the figure, find the intensity at the centre of the screen

If the distance between a point source and screen is doubled, then intensity of light on the screen will become

If the distance between a point source and screen is doubled, then intensity of light on the screen will become

If distance between source and screen increases by 2%, then intensity obtained at screen will be .......

In the figure shown, O is a point source of light and S is a screen placed at a distance L from the source. Intensity of light at point A on the screen due to the source is 81 I where I is some unit. Now a large mirror (M) is placed behind the source at a distance L from it. The mirror reflects 100% of the light energy incident on it. Calculate the inten- sity at point A. ,brgt

A mono chromatic light source of wave length I is placed at a distance R from the mirror as shown and a spherical screen of radius R is at a distance R from the source as shown in the figure and point P is on the sphere nearest to the source.It R is two times the wave length (R=2l) then f'+(p)